#964. Longest palindromic substring
You get a string. Print its longest palindromic substring (if there is a tie, the leftmost one).
### Input
One line.
### Output
One line.
Examples
Input
bbaca
Output
aca
Input
bcbbc
Output
cbbc
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.